用GC／MS研究β-二酮结构树脂紫外光自固化的光解及固化  

Photolysis and Curing of Self-Initiative UV Resin with β-Diketone Structure by GC/MS

作　　者：张夏虹[1] 杨建文[2] 王胜年[1] 

机构地区：[1]中交四航工程研究院有限公司,广州510230 [2]中山大学化学与化学工程学院,广州510275

出　　处：《功能高分子学报》2008年第1期76-79,共4页Journal of Functional Polymers

摘　　要：通过碱催化乙酰丙酮和丙烯酸乙酯的迈克尔加成反应,合成了4,4二乙酰庚二酸二乙酯(EDAP),该化合物具有可紫外光自固化的β-二酮结构但无光固化基团,利用气相色谱质谱联用(GC/MS)研究其光解机理从而推断紫外光自固化树脂的固化机理。结果显示季碳原子上接有两个乙酰基的化学结构在紫外光照下不稳定,容易发生裂解,脱掉乙酰基自由基,由此在无光引发剂下仍可以引发丙烯酸酯类单体和低聚物的自由基光聚合。A model compound ethyl 4,4-diacetylpimelate（EDAP） was synthesized through Michael addition of acetylacetone （acac） with ethyl acrylate （EA） using alkali as catalyst. Lacking of photosensitive groups, the β-diketone molecular structure can be self-UV-cured. GC/MS was utilized to study the photolysis mechanism of EDAP so as to infer the self-initiation and curing process of the UV resins. Results show the diketone moiety attached full-substitued carbon atom is photoscissile and prone to produce alkyl free radicals by losing acetyl free radical. Polymerization of the acrylated β-diketone-containing oligomers can be efficiently triggered under UV light irradiation without photo-initiator.

关 键 词：紫外光固化 迈克尔加成 气相色谱质谱联用 

分 类 号：O63[理学—高分子化学]